Waste Water Treatment Flashcards
1
Q
What is the first process of sewage treatment?
A
Screening
2
Q
What is the second process of sewage treatment?
A
sedimentation
3
Q
What does screening do?
A
removing large bits of material like twigs or plastic bags
4
Q
What does sedimentation do?
A
The heavier suspended solids sink to the bottom to produce sludge while the light effluent floats on the top
5
Q
What happens to the effluent after sedimentation?
A
It is treated by biological aerobic digestion
6
Q
What happens to the sludge after sedimentation?
A
It gets broken down by bacteria this process is called anaerobic digestion
